In this article you will learn the solution to the common error "Only one <configSections> element allowed".Today I was working on Entity Framework and trying to add the connection string to the Web.Config to specify the database. I wrote the connection string like this:

When I run the application, I experienced a strange error that says: "Only one <configSections> element allowed. It must be the first child element of the root <configuration> element".

It took me some time to determine the cause of the error and how to fix it.Error: "Only one <configSections> element allowed. It must be the first child element of the root <configuration> element".

If you read the error carefully, it states that only one <configSections> element is allowed inside the Web.config and it should be the first child element and placed at the top. The reason for the error is that I accidentally placed the <connectionStrings></connectionStrings> at the top over the <configSections></configSections> and by conventions this is a violation. So, to fix the error, I rearranged the elements and the error was fixed.

Paging with ASP.NET Web API OData

What is OData?

OData, short for Open Data Protocol, defines a protocol for the querying and updating of data utilizing existing Web protocols. OData is a REST-based protocol for querying and updating data and is built on standardized technologies such as HTTP, Atom/XML, and JSON. It is different from other REST-based web services in that it provides a uniform way to describe both the data and the data model. It is considered to be a flexible technology for enabling interoperability between disparate data sources, applications, services and clients.

Step by Step

When the API call returns the list of repositories in the body of the response as a JSON array:

It does not state the total number of records anywhere in the resulting JSON, not does it return the current page or the number of records per page which you requested. What it does however is to return the pagination information in the Link header of the request. So in the case of my API call above it returns the following Link header:

So it allows you to request subsequent pages by requesting the URL in the Link header with the relation type (rel parameter value) of “next”. Also to get the total number of pages you will need to extract the page query parameter from the link with the relation type of last.

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In this tutorial I will show you how to upload a files in ASP.NET MVC 4.0. So how to do this?? Lets get start. Create a new MVC 4.0 application and add a new controller, name it as HomeController. We will use Index ActionMethod to write the code to upload the file.

We need two ActionMethod named Index, one is for HttpGet and another for HttpPost. Within the HttpGet ActionMethod we don't need to write anything.

Lets create the View first. To create the View right click on the ActionMethod Index and click on the Add View option.

Here we have taken a simple HTML file up loader and a submit button. Within the form we are calling the ActionMethod Index, which is present in HomeController. A ValidationSummary to show all validation message.

Now get back to the ActionMethod. Within the Index ActionMethod (HttpPost) write down the code.

Before run this project don't forget to create a Upload folder within root directory, otherwise you will get an error.

HttpPostedFileBase file getting the file which you are uploading.

file.ContentLength : Size of the filefile.FileName : file name with extension

Now run your project and enjoying your uploading.

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Dynamically Create Meta Description Using ASP.NET

HTML “meta description” allows us to describe web pages with short and sometimes elaborated details. Descriptions written inside the <meta> tag, must always to specific and are often limited to very few characters. Using Asp.Net, we can easily create “meta” descriptions dynamically, through code behind procedures, describing the contents of the page.

We all know how important it is to use meta tags when you’re building an internet web site. Meta tags provide metadata about the HTML document. They are not rendered in the browser but are used by search engines to parse web pages. The following article demonstrates how to store meta tags for each page in an XML file and how to use LINQ to read the XML data and dynamically create meta tags for each page in your website.

Add a Master Page to the project. Once that is completed, add a Web Content Page and select the newly created Master Page as the Master Page.

The next step is to create a new folder in the web site to demonstrate all pages in the website will have dynamic meta tags at runtime. Right click the website and choose Add > New Folder. Name the new folder ChildFolder. After this add a new Web Content Page to this folder. Leave the default name as this is not important.

Now that we have two pages in different folders, it’s now time to create an XML file that contains the data for the meta tags. Right click the website and choose Add > New Item > XML File. Name the file TagData.xml and add the following XML:

In the XML above I have created a parent node called metaTags. Inside I have created a tags node which contains a pageName attribute. That value is how we will match the current requested page to the XML data. Each tags node contains a tag node that corresponds to the meta data we want sent to the browser. In this example I want to set meta tags for the all the pages to have keyword, description and author meta tags, but the values rendered to the browser will differ depending on what page the user is on. In a real world scenario this information would be stored inside a database, but I decided to keep this data inside an XML file to keep it simple and focus on how to do this.

Having outlined what meta tags we want sent to the browser, we now have to write the code that will read the XML file and dynamically add the meta tags at runtime. Seeing as though we’re using Master Pages this is the ideal spot to add it. Add the following code to read the XML file:

For flexibility and ease of use I have decided to use the power of LINQ to XML to read the XML data. To start with the XML document is load into an XDocument object. From there I have created a LINQ query to return all the tag nodes where the parent node has an attribute called pageName and the value is equal to the current page. Then the object returned is an anonymous type that has a Value and Name property. The values of those properties are the value and name attribute values.

Now that we have the data in memory, the next step is to create the meta tag and add it to the page dynamically. To do this you use the HtmlMeta class. This allows you programmatic access to the HTML meta tags. Add the following code below to your project:

VB.NET

The foreach loop enumerates through each item returned from the LINQ query. It assigns the Name and Content value to the HtmlMeta object. Finally the object is added to the page by calling Page.Header.Controls.Add(meta). Run the project and once the default page has loaded, view the HTML source and you’ll see the meta tags have been added to the website.

MetaTags

Browsing to the second page and viewing the HTML source, you’ll find the meta tags have been added to the page but they’re different values from the previous page.

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How To Configuration in ASP.NET 5

Goodbye XML, Hello JSON

In the past, ASP.NET has been built on a foundation of XML. Web Forms .aspx and .ascx files are basically XML files and configuration in previous versions of ASP.NET is managed in an XML file called web.config. The web.config file has a particular structure and a class (System.Web.Configuration.WebConfigurationManager) devoted to providing access to it. In ASP.NET 5 JSON is the preferred format for storing structured information such as configuration. This change has largely been driven, I suspect, by the desire to appeal to web developers working on other platforms who are more used to JSON as a structured data format. The first article in this series has already looked at the new JSON solution and project files: global.json and project.json.

The default replacement for the web.config file is config.json. You can also choose to use an XML file if you prefer, and INI files, environment variables, command line arguments and an in-memory option are supported natively too. The template for a config.json file is labelled as ASP.NET Configuration File in the Add New Item dialog:

When you add one, the templated content provides a placeholder for a connection string:

Strongly Typed AppSettings

In earlier versions of ASP.NET, it is quite common to store application-wide constants in the appSettings section of a web.config file. You can store these values in the config.json file instead. Previous Beta release templates included an example of this, but it has been removed from the Beta 6 template. The steps described below demonstrate how to use the config.json file to store appsettings and how to provide strongly-typed access to them.

Press Ctrl+F5 to run the application without debugging. You should see "My Web Site" written to the browser.

You started by adding a new section called AppSettings to the config.json file and declaring a property with a value. Then you created a C# class called AppSettings with one property that matches the one you added to the config file. The AppSettings class is designed to provide strongly typed access to the appSettings section of the config.json file. You added a couple of packages to the project.json file to make them available to the application. The first package enables you to use JSON as the format for your configuration data. The second package introduces MVC into the application.

In the Startup class, you added a constructor where you instantiated a variable representing the project's configuration as the config.json file and assigned that to a property that you created of type IConfiguration. This holds the values loaded from the configuration source (the config.json file). You made the AppSettings available to the application by registering it with the dependency injection system in the ConfigureServices method. The method you used mapped the json values from the configuration file to the AppSettings class. You also registered the MVC framework with the dependency injection system. Finally, you used the GetService<T> extension method to retrieve the AppSettings from the DI system in the Startup class'sConfigure method where you used them to write the SiteTitle value to the browser.

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Bootstrap Tree View in ASP.Net MVC

The ASP.NET MVC is an almost open source web application framework that implements the model–view–controller (MVC) pattern. The ASP.NET MVC framework is a lightweight, highly testable presentation framework that (as with Web Forms-based applications) is integrated with existing ASP.NETfeatures, such as master pages and membership-based authentication. Bootstrap is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first web sites.

We create two classes, one is AuthorViewModel and another is BookViewModel. AuthorViewModel is the main class that has an association with the BookViewModel class. In other words each AuthorViewModel class object has a list of BookViewModel class objects. The following is the code snippet for the BookViewModel class.

Now we create a controller “HomeController” that has two action methods for both GET and POST requests. The action method's name is “Index”. The Get request action method returns a tree view in the UI whereas the POST request method gets the posted data from the UI. The following is the code snippet for HomeController.

using System.Collections.Generic; using System.Linq; using System.Web.Mvc; using TreeView.Models;

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